Synthesis and characterization of a novel graft copolymer of partially carboxymethylated guar gum and N-vinylformamide

Mishra, Meenakshi; Mishra, Dinesh Kumar; Mishra, Pushyamitra; Behari, Kunj

doi:10.1016/j.carbpol.2012.12.027

Cited by 17 publications

(6 citation statements)

References 41 publications

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“…Graft copolymerization studies show that polymer concentration is an important parameter to enhance grafting percentage . The effect of alginate concentration on the percentage of grafting and efficiency was carried out by changing the concentration of alginate from 0.5 to 2 g/dL.…”

Section: Resultsmentioning

confidence: 99%

Temperature‐responsive alginate‐g‐poly(N,N‐diethylacrylamide) copolymer: Synthesis, characterization, and swelling behavior

Işıklan

Altınışık

2018

J of Applied Polymer Sci

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Temperature‐responsive polymers have recently gained importance due to their applications in drug delivery. Herein, temperature‐responsive graft copolymer (Alg‐g‐PDEAAm) of alginate and N,N‐diethylacrylamide was synthesized by microwave‐assisted copolymerization using potassium persulfate/N,N,N′,N′‐tetramethylethylenediamine initiator system. The reaction conditions for the best grafting (331%) have been optimized by changing microwave irradiation time, temperature, N,N‐diethylacrylamide, and alginate concentrations. The spectroscopic characteristic, thermal properties, and surface morphology of the copolymers were investigated by FTIR, 1H‐NMR, DSC/TGA, XRD, gel permeation chromatography, and SEM. Furthermore, low critical solution temperatures of Alg‐g‐PDEAAm copolymers were detected by UV spectroscopy. Swelling ratio of graft microspheres was carried out at 25, 32, and 37 °C, and microspheres were found exhibiting temperature‐responsive property. Cytotoxicity test indicated the Alg‐g‐PDEAAm copolymer and its microsphere were biocompatible. Therefore, based on the results the synthesized temperature‐responsive copolymer could be considered as a promising biomaterial. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018, 135, 46688.

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Section: Resultsmentioning

confidence: 99%

Temperature‐responsive alginate‐g‐poly(N,N‐diethylacrylamide) copolymer: Synthesis, characterization, and swelling behavior

Işıklan

Altınışık

2018

J of Applied Polymer Sci

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“…This mechanism leads to a simple, in-situ preparation of functionalized electrodes, which is the key to triggering redox reactions and enhancing the EDLC performance. In addition, the elevated amount of oxygen functional groups induced on the graphitic surface by the functionalization process is expected to significantly increase the graphene inter-layer spacing, potentially up to ~0.45 nm as we have recently shown [49] . An increased inter-layer spacing, as well as an anticipated improved wettability of the graphitic electrodes due to the functionalization, would enable the PVA molecules to diffuse more efficiently between the 9 electrode layers and intercalate the graphene, overall greatly enhancing the total extent of 10 electrode/electrolyte interface in the cell, hence the EDLC capacitance (see schematic in Figure 11 6).…”

Section: Long Charge/discharge Measurements Of the Cell Fabricated With The Oxidized Graphitic Electrodesmentioning

confidence: 90%

“…Joshi et al [47] reported similar spectra for graphene nanoribbons bonded to PVA. 12 The FTIR spectrum of the as-prepared oxidized electrodes in Figure 5b shows peaks related to the 3C-SiC, TO peak at 794 cm -1 , LO at 970 cm -1 , in addition to a peak around 1060 cm -1 which is commonly attributed to the epoxy functional groups and a peak at ~1225 cm -1 which originates 3 from the hydroxyl functional groups [49][50][51][52] . FTIR spectra of the oxidized electrodes after the insitu electrochemical treatment confirm the enhanced presence of oxygen functional groups on the surface (Figure 5b and S7).…”

Section: Long Charge/discharge Measurements Of the Cell Fabricated With The Oxidized Graphitic Electrodesmentioning

confidence: 99%

Graphitic‐Based Solid‐State Supercapacitors: Enabling Redox Reaction by In Situ Electrochemical Treatment

Amjadipour

Iacopi

2020

Batteries & Supercaps

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The quest for supercapacitors that can hold both high energy and power density is of increasing significance as the need for green and reliable energy storage devices grows, for both large-scale and integrated systems. While supercapacitors for integrated technologies require a solid-state approach, gel-based electrolytes are generally not as efficient as their aqueous counterparts. Here we demonstrate a strategy to enhance the performance of quasi-solid-state supercapacitors made by graphitized silicon carbide on silicon electrodes and polyvinyl alcohol (PVA) + H2SO4 gel electrolyte. The electrochemical characterization shows an increase of the specific capacitance of the cell up to 3-fold resulting from a simple agent-free, in-situ, electrochemical treatment leading to functionalization of the graphitic electrodes. The functionalization of the electrodes simultaneously enables redox reactions, without adding any redox agent, and increases the double layer contribution to the overall capacitance. The strategy and insights offered by this work hold great promise for improving quasi-solid-state, miniaturized on-chip energy storage systems, which 3 are compatible with silicon electronics. 4

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“…It is due to their economical, green, washable, biodegradable nature and they cause no fabric stiffeness [3,[13][14][15]. Grafting of partially carboxymethylated guar gum and N-vinyl formamide was synthesized for textile applications via free radical polymerization using 2,2-Azobis [2-(2-imadazolin-2-yl) propane]dihy-drochloride as an initiator [16][17][18]. Gong et al [17] carried out carboxymethylation of guar gum with a multi-step process.…”

Section: Introductionmentioning

confidence: 99%

Green synthesis and characterization of carboxymethyl guar gum: Application in textile printing technology

Iqbal

Nazir

Iqbal

et al. 2020

Green Processing and Synthesis

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AbstractThis study focusses on the synthesis of carboxymethyl guar gum (CMG) via monochloroacetic acid under alkaline conditions. The reaction conditions were also optimized during the course of experiment. Guar derivative with variable degree of substitution (DS) were prepared and were confirmed by Fourier transform infrared (FTIR) spectroscopy. The DS was determined quantitatively by titration method for each derivative. The synthesized guar gum derivatives, being the natural thickners, have been used in textile printing technology. Substituted guar gum has been proved environmental friendly thickener as compared to synthetic thickeners. Penetration properties, fixation ability, colour fastness, levelness and fabric handling was compared with alginate thickener (commercially available). Guar gum thickeners showed enhanced properties versus alginate thickener and can be used as an alternative to synthetic thickeners in view of its green, non-hazardous and economical derivatives. Guar gum is the outstanding natural thickener, stabilizer, gelling agent and could possibly be used in various industrial units including food, cosmetic, textile, oil fracturing and mining.

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Synthesis and characterization of a novel graft copolymer of partially carboxymethylated guar gum and N-vinylformamide

Cited by 17 publications

References 41 publications

Temperature‐responsive alginate‐g‐poly(N,N‐diethylacrylamide) copolymer: Synthesis, characterization, and swelling behavior

Temperature‐responsive alginate‐g‐poly(N,N‐diethylacrylamide) copolymer: Synthesis, characterization, and swelling behavior

Graphitic‐Based Solid‐State Supercapacitors: Enabling Redox Reaction by In Situ Electrochemical Treatment

Green synthesis and characterization of carboxymethyl guar gum: Application in textile printing technology

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